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Stainless steel classification
Stainless steel is the material in the air or chemical corrosion medium to resist corrosion of a high alloy steel. Stainless steel is a beautiful surface and good corrosion resistance, without having to go through the surface treatment such as plating, so as to play a stainless steel Inherent surface properties Stainless steel is formed from the chromium-rich oxide film (passivation film) on the surface of its stainless steel and corrosion resistance.With the development of various industries, stainless steel to adapt to the working conditions of the differentiation, namely in The original two systems based on the status of the three organizations, by adding and subtracting carbon content and adding a variety of other alloying elements and derived many new stainless steel.
Many types of stainless steel, according to China's national standard GB / T 13304-1991 "steel classification" and internationally accepted classification methods can be divided into the following major types
According to the microstructure of stainless steel classification:
1. Austenitic stainless steel, such as 304, 316, 321 and so are austenitic stainless steel, non-magnetic stainless steel
2. Ferritic stainless steel, also known as stainless steel, such as 4CR13, S136, 430, 434 and so are ferritic stainless steel, magnetic stainless steel
3. Martensitic stainless steel, such as 403, 410, 414, 416, 420, 431, 440A, 440B, 440C are all martensitic stainless steel, magnetic stainless steel
4. Duplex stainless steel, refers to the material matrix contains two kinds of microstructure of stainless steel, such as 3RE60, 2205, 4410, 4507, ASTMA890 are all duplex stainless steel, magnetic stainless steel
5. Precipitation hardening stainless steel, such as 17-4PH, 17-5PH, 17-7PH, SUS630, S1700 are all precipitation hardening stainless steel, magnetic stainless steel
According to the chemical composition of stainless steel classification:
1. Chrome-based stainless steel (CR series), such as ferritic stainless steel, martensitic stainless steel
2. Chrome-nickel stainless steel (CR-NI series), such as austenitic stainless steel series, precipitation hardening stainless steel series
According to the use of stainless steel classification
1. Nitric acid-resistant stainless steel
2. Sulfuric acid stainless steel
3. Pitting corrosion-resistant stainless steel
4. Resistance to stress corrosion of stainless steel
5. Low temperature stainless steel
6. Non-magnetic stainless steel
7. High-strength stainless steel
8. Easy to cut stainless steel
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